1. Boil the eggs in a pot of water for 10 minutes.
2. Remove the eggs and rinse under tap water.
3. Gently, use a teaspoon to tap on the eggshell to create crack lines.
4. In another pot, add the soya sauce, tea leaves, cinnamon stick, star anise, cloves, sugar, and water. Bring to a boil.
5. Add the eggs and lower the fire.
6. Simmer for 2 hours, or more for a stronger taste.
7. Add Huiji Waist tonic 10 to 15 minutes before you off the fire